Why is it important to use tag lines during a lift?

Using tag lines during a lift is crucial for controlling the load and preventing it from swinging. When a load is hoisted by a crane, it can generate momentum and may begin to swing if not managed properly. Swinging loads pose a significant safety risk as they can collide with structures, workers, or other equipment. By attaching tag lines to the load, ground personnel can help guide and stabilize it during the lift, maintaining a more controlled and safe operation.

The other choices, while they may relate to lifting operations, do not capture the primary purpose of tag lines. For instance, signaling the crane operator plays an important role but is typically done through radios or hand signals; tag lines are not used for this purpose. Measuring the height of a lift and ensuring the load is secure are also important tasks but are handled through different protocols and tools, rather than utilizing tag lines. Thus, the use of tag lines is primarily focused on load control and stability during lifting operations.